Air bubbles in babies' tummies. Please help?

[Kristen0888]

I have about 4 babies in different containers, that are getting a little air bubble in their stomach, which I can see the little air bubble. After an hour or two it does go away, but some keep getting them. What is causing this? The picture I posted is the only one that has it now and it looks worse than I have seen in any of them. I want to know what I can do to prevent it and help them move the air bubble.

Since this will be asked:
I feed them bbs twice a day, about 12 hours apart.
I wait about an hour or two for all to eat then put them in freshly cleaned and scrubbed containers with the water a little over half full (100% water changes) after the feedings. I have about 20 in each container, the container holds 126.5 fl oz, with some in smaller containers, the smallest and weakest. I use water conditioner and let the water sit 24 hours before I use the water, just in case. I check the water for ammonia each day, and it is always between 0 and .25 (not quite .25, more in between, I use the API test thing, not the strips). But, if it is reading around.25, I add more fresh water til the next feeding, to be sure they are safe. As I can tell, none are showing stress or gasping for air at the top or anything.

 

[Morrison]

Maybe they're not eating enough. You said you feed them twice a day. When I feed larvae they pretty much swim in their BBS. So it's better that they have a constant supply of live food around them. Feeding them twice a day isn't wrong, as long as they have enough BBS to eat the whole day

Another thing that might be the problem is high temperature. When water gets too hot it has less oxygen in it and axies will gulp air more often (they like to do those things when we don't look at them, lol) and then they can swallow some air and end up floating. Upside down, side up, bum up, etc). I've seen that a lot in the summer. Then I added an air stone (and a fan, cooling the water surface) and everything pretty much went back to normal.

So I would check the temperature. If it's too hot I would put the containers in a cool(er) place and even use an air stone if you're not already using it.

Hope this works!